Instrument for the taking and injection of blood



Aug. 8, 1950 A. c. MILLARD INSTRUMENT FOR THE TAKING AND INJECTION OFBLOOD Filed Sept. 11, 1948 I Q I INVENTOR fl/mz 6249mm mun/en BY YATTORNEYS Patented Aug. 8, 1950 UNITED IN STBUMENT FOR THE TAKING DINJECTION OF BLOOD Andr Charles Mil-lard, Lyon, France ApplicationSeptember 11, 1948, Serial No. 48,818.

In France July 9, 1 947 I 1 Claim.- (01. 128-.21:4)

This invention relates to instruments for the taking of blood and forinjection.

It isalready known to provide sterile instruments. for the aseptictaking .of blood, said instruments comprising a rubber end-piece whichis mounted at one end, on a test-glass for receiving theblood and isintegral at itsother end, with a glass tube that carries the needle andis extended into the aforesaid end-piece bya bent part which restsagainst its internal periphery, advantagev being taken of the elastcityof the endpie'ce by changing .the inclination .of the needlesupportingtube in relation to the test-glass, in order to establishor .cut offcommunication with the vacuum previously created in the said testglass.

This kind of sterile apparatus for the aseptic taking of "bloodpresents,for the practitioner, certain difficulties by reason of the fact that,in order to ensure the maintenance of the vacuum in the test-glass whenthe needle has been uncovered and also to ensure the air-tightness of vthe test-glass after the taking of the blood, it is necessary that thepressure of the bent part of the needle-carrying tube against theinternal periphery of the rubber end-piece should be sufiiciently great;conversely, this renders it necessary after having pierced the vein withthe needle, to develop a force that is suificiently great to obtain therequired change of inclination.

There is therefore a risk of the needle swerving in the vein, thuscausing the patient pain and leading to a defective taking of blood.

The present invention concerns an instrument of this kind which obviatesthe aforesaid disadvantages.

It is characterised essentially by the fact that, in a rubber tube,which connects the test-glass to the needle-carrying tube, there isinserted a ball, preferably made of glass, the diameter of which isgreater than that of the orifice of the said rubber tube, so as tostretch the tube on its inside and thus ensure closure thereof, theclosing effect being easily eliminated, at the moment of piercing, bysimple external squeezing of the said rubber tube, between the fingers,opposite the ball. This squeezing produces in effect, a deformation ofthe rubber and causes the rubber to slip on the ball, thereby creatingtwo lateral passages around the ball.

It is thus seen that the drawbacks set forth above, of the existinginstruments, are wholly eliminated, since the placing of theneedle-carrying tube into communication with the testglass and also itssubsequent closure are obtained Without the necessity'of changing theposition of the said needle-carrying tube in relation to the test-glass.I v In addition to its 'great ease of manipulation, the instrumentaccording to the invention 'is also very easyto manufacture. v

In the foregoing, reference is made more especially to the taking ofblood by vacuum created previously inside the test-glass in order toproduce therein suction of the blood. ;It can easily be'seen, however,that the same instrument can be applied, without modification, toinjections by putting under pressure, in the'test-glass, the liquid tobe injected. In contradistinction with the taking of blood for which'the test glass is first submitted to vacuum before it is sealed, it isnecessary in such a case to fill the testglass before sealing itwiththel'iquid to be injected, preferably under the pressure of a smallamount of a neutral gas. Both the evacuation of the test glass and itsfilling under pressure may be performed in any suitable manner wellknown in the art.

According to an embodiment of the invention which is more particularlyadvantageous although not essential, the rubber tube, which provides theconnection between the test-glass and the needle-carrying tube, may beformed, opposite the position' of the ball situated within it, with twoopposite enlarged or flat parts, on which the fingers are to be placed,to ensure and facilitate the squeezing of the rubber tube.

The invention consequently covers, as a new industrial product, anysterile instrument for the aseptic taking of blood or injection, inwhich the closure and temporary opening of the communication between thetest-glass and the needlecarrying tube is obtained in the manner hereindescribed.

In order that the invention may be more clearly understood, the samewill now be described, by way of example, with reference to theaccompanying diagrammatic drawings, in which:

Figure 1 is a part-sectional view of the instrument;

Figure 2 is, on a larger scale, a longitudinal section of the rubbertube in its ball-receiving part; and

Figures 3 and 4 are, on the same enlarged scale, two cross-sections onthe line 3-3 of Figure 2 and show respectively the tube in shut-off andopen positions.

Referring to the drawings: I denotes the testglass; 2 denotes the rubbertube which is securely mounted thereon by an end-piece 3 also of rubberand integral therewith; 4 is a glass tube which is mounted at the end ofthe tube 2 and in which is sealed the needle 5 covered by the protectingcap 6.

As shown in Figure 1, the tube 2 is normally straight when the device isheld in inclined position or, in other words, is semi-rigid so that thedevice may be readily manipulated with one hand.

Inserted within the tube 2 is a, ball I which is preferably made ofglass and the diameter of which is greater than that of the orifice ofthe said tube, so as to stretch the tube on its inside by the elasticexpansion of the rubber. The arrangement thus ensures the closure-of thetube 2 by eliminating all communication between the test-glass, insidewhich a vacuum has been previously created, and the needle-carryingtube.

The aforesaid rubber tube 2 comprises on the outside opposite the ball1, two fiat parts 8 which are 180 apart.

In order to carry out an aseptic blood-taking with this instrument, itis sufficient, after having removed the cap 6. by filing at x-ac andafter having piercedthevein with the needle 5,-to take hold of the tube2 between two ,fingers by its flat parts 8' and to squeeze it, asindicated by the arrows shown in Figure 4;, The rubber is squashed andslideson the ball 1 thereby creating two lateral passages 9 which bringthe test-glass l and the needle-carrying tube 4 into communication witheach other. The-blood then flows into the test-glass. When theblood-taking is finished, it is sufficient to release the tube 2 which,returning to its original diameter, closes the testglass by means of theball 1.

In order to remove theneedle from the blood filled test glass after theblood taking is terminated, it is sufficient to break the tube 4 afterfiling at y--y. Thus the test glass may be sent to a laboratory foranalysis under perfectly sterile conditions without it being necessaryfor it to be accompanied by the needle and associated end of the tube 4.

What I claim is:

A syringe or the like instrument for medical purposes, comprising anampule, syringe needle, a straight tube of an elastic material securedto the open end of the ampule and the rear end of the needle,respectively, said tube forming a straight, fluid type, semi-rigidconnection between said ampule and needle and having part of its lengthexposed for grasping by the fingers of the operator, and a ball of rigidmaterial having a diameter in excess of the inner diameter of said tubeand being seated in the exposed part of the latter, whereby pressure ofthe operators fingers on the ball creates a temporary deformation ofsaid tube, to increase its inner diameter at right angles to thedirection of the pressure and to provide passages for a fluid past theball.

ANDRE CHARLES MILLARD.

REFERENCES CITED The following references are of record in th file ofthis patent: 1

UNITED STATES PYA'IENTS

